| Full text | |
| Author(s): |
Murcia, Jhonathan O. P.
;
Prado, Antonio F. B. A.
;
Singla, P
;
Weisman, RM
;
Marchand, BG
;
Jones, BA
Total Authors: 6
|
| Document type: | Journal article |
| Source: | ASTRODYNAMICS 2018, PTS I-IV; v. 167, p. 17-pg., 2019-01-01. |
| Abstract | |
In a three body system, with the Sun as the massive body, a planet as secondary body and a spacecraft as a massless body, the change in the spacecraft trajectory due to a close approach with the planet is known as a gravity-assisted maneuver. If the planet has atmosphere and the pericenter of the spacecraft is lower than the atmospheric limit, the aerodynamic forces affect the gravity-assist, and the new maneuver is known as aero-gravity assisted. Including an instantaneous impulse in the pericenter, it is created the powered aero-gravity-assisted maneuver. The present paper uses this type of maneuver considering Drag, Lift and the bank angle to control the Lift direction. With this maneuver, it is possible to make energy and inclination changes in the trajectory of the spacecraft, which are very expensive maneuvers. A value of L/D = 9.0 is used to represent the maximum value used by waveriders spacecrafts to get maximum effects of Lift. Due to the proximity with the Earth, the presence of planetary atmosphere and applications in previous gravity assisted maneuvers, the planets Venus and Mars are selected to be used in the numerical simulations. A RKF 7/8 integrator with adaptive step is implemented. To observe the influence of Lift and Drag, the ballistics coefficient changes from 0.0 to 5x10(-7) km(2)/kg and the impulse at the pericenter is 0.5 km/s. Results show that controlling the Lift directions makes possible to increase or reduce the energy variations of the spacecraft. (AU) | |
| FAPESP's process: | 16/14665-2 - Astrodynamics applied to space vehicles. |
| Grantee: | Antônio Fernando Bertachini de Almeida Prado |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 16/24561-0 - On the relevance of small bodies in orbital dynamics |
| Grantee: | Othon Cabo Winter |
| Support Opportunities: | Research Projects - Thematic Grants |